To investigate the risk factors of congenital oblique inguinal hernia in children.

352 cases of congenital inguinal hernia patients from February 2018 to June 2020 were selected as the inclined hernia group，and 352 cases of hospitalized children without external abdominal hernia，congenital malformation or malignant tumor were selected as the control group by 1：1 ratio of gender and age（±0.5）years. The risk factors that may affect the incidence of congenital oblique inguinal hernia in children were collected. Univariate analysis was performed by Chi-square test or t test，and multivariate analysis was performed by Logistic regression.　 P<0.05 was considered statistically significant.

The results of multivariate Logistic regression analysis on the basis of single factor showed that：Birth weight<2.5 kg（OR=1.571，95%CI= 1.111-2.223），family history of groin（OR=1.589，95%CI=1.112-2.270），maternal history of anemia during pregnancy（OR=1.508，95%CI=1.054-2.159），maternal tea drinking ≥1 times/week during perinational pregnancy（OR=1.531，95%CI=1.099-2.132）and maternal history of active/passive smoking（OR=1.536，95%CI=1.136-2.077）was a risk factor for congenital oblique inguinal hernia in children（P<0.05）.

The incidence of congenital oblique inguinal hernia in children is related to birth weight，family history of inguinal hernia and other factors. Clinical intervention of these factors can reduce the incidence of congenital oblique inguinal hernia.